Artículo
Abstract:
Based on HI maps covering the 3 600 square degrees area delimited by 230° ≤ l ≤ 290°, -30° ≤ b ≤ 30°, we investigated the neutral hydrogen distribution in the Gum nebula and its environments. The main result is the appearence of a huge disk of neutral gas at a kinematical distance compatible with that of the nebula, and whose angular dimensions coincide with the optical image of the Gum nebula. The disk, roughly centered at l ≃ 262°, b ≃ -3°, is located at ∼ 500 pc and has a radius of ∼ 150 pc. We propose that this HI disk is the neutral gas component of the optical nebula, hence becoming the first time in which a structure with the dimensions of the optical nebula is detected in other wavelengths. We analyze the fitting of observations with different theoretical models and conclude that the most plausible interpretation is that the Gum nebula is a supershell produced by the action of repeated SN explosions, where the explosions may have originated in the aged association Vela OB2. In this context, the thick HI shell shown by Dubner et al. (1992) near (266°, -2.5°) and the Vela SNR are the debris of two of the several outbursts which started in the region about 6 10 6 years ago. The southern boundary is distorted due to the presence of a ∼ 28° radius shell, which appears to be an interstellar bubble driven by the stellar winds of the O-type star HD 49798.
Registro:
| Documento: | Artículo |
| Título: | Cold neutral gas associated with the Gum nebula |
| Autor: | Reynoso, E.M.; Dubner, G.M. |
| Filiación: | Instituto de Astronomía y Física del Espacio, C.C.67, Suc. 28, 1428 Buenos Aires, Argentina CONICET, Argentina Carrera del Investigador Científico of CONICET, Argentina |
| Palabras clave: | ISM: bubbles; ISM: individual objects: Gum nebula; ISM: supernova remnants; Radio lines: ISM |
| Año: | 1997 |
| Volumen: | 123 |
| Número: | 1 |
| Página de inicio: | 31 |
| Página de fin: | 41 |
| DOI: | http://dx.doi.org/10.1051/aas:1997304 |
| Título revista: | Astronomy and Astrophysics Supplement Series |
| Título revista abreviado: | Astron Astrophys Suppl Ser |
| ISSN: | 03650138 |
| CODEN: | AAESB |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03650138_v123_n1_p31_Reynoso |
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Citas:
---------- APA ----------
Reynoso, E.M. & Dubner, G.M. (1997) . Cold neutral gas associated with the Gum nebula. Astronomy and Astrophysics Supplement Series, 123(1), 31-41.http://dx.doi.org/10.1051/aas:1997304
---------- CHICAGO ----------
Reynoso, E.M., Dubner, G.M. "Cold neutral gas associated with the Gum nebula" . Astronomy and Astrophysics Supplement Series 123, no. 1 (1997) : 31-41.http://dx.doi.org/10.1051/aas:1997304
---------- MLA ----------
Reynoso, E.M., Dubner, G.M. "Cold neutral gas associated with the Gum nebula" . Astronomy and Astrophysics Supplement Series, vol. 123, no. 1, 1997, pp. 31-41.http://dx.doi.org/10.1051/aas:1997304
---------- VANCOUVER ----------
Reynoso, E.M., Dubner, G.M. Cold neutral gas associated with the Gum nebula. Astron Astrophys Suppl Ser. 1997;123(1):31-41.http://dx.doi.org/10.1051/aas:1997304
